ADVANCED PDF
Free File Size Checker online
Check file size and info of your PDF.
File Size Checker is a free browser tool that lets you check file size and info of your PDF. Drop your file into File Size Checker, choose your settings, and save the finished file. File Size Checker works on your device only, so no file or text is ever uploaded.
- Free to use
- No signup
- No uploads
- Works offline
Why use File Size Checker
- check file size and info of your PDF without installing software
- Your file is processed on your device by File Size Checker, never uploaded
- File Size Checker needs no account, email address or payment details
- File Size Checker is batch-friendly: reuse it immediately on the next file
- File Size Checker is keyboard accessible and screen-reader friendly
- File Size Checker is free forever, with no watermark on the result
File Size Checker runs entirely inside your browser. Your file is never uploaded, stored or shared, and nothing is retained once you close the tab.
How to use File Size Checker
- Add your file Drag your file onto the drop zone or pick it from your device.
- Adjust the options Set the options that control how File Size Checker handles your input.
- Run the tool File Size Checker works instantly on your device, with no queue and no upload wait.
- Download the result Save the finished file straight to your device, then reuse the tool as often as you like.
Benefits
Private by design
Your file stays on your device while File Size Checker works. File Size Checker never sends it to a server, so confidential work stays confidential.
Instant results
File Size Checker finishes most jobs in under a second because the work happens on your own hardware.
No signup, no limits
Use File Size Checker as many times as you want. File Size Checker asks for no account, adds no watermark and keeps no paid tier gating the output.
Works offline
Once the page has loaded, File Size Checker keeps working without a connection, which helps on flights and locked-down networks.
Who it is for
For students
Students use File Size Checker to hand in coursework without installing software: check file size and info of your PDF on a shared or locked-down machine.
For freelancers
File Size Checker helps freelancers send client deliverables quickly, since your file never leaves the laptop it was created on.
For HR and admin teams
File Size Checker helps HR and admin teams process paperwork quickly, since your file never leaves the laptop it was created on.
How it works
File Size Checker parses your input in the browser and walks its structure to collect the measurements shown on screen. File Size Checker is read-only: the source is held in memory for the session and discarded when you close the tab.
Frequently asked questions
Is File Size Checker free to use?
Yes. File Size Checker is completely free with no account, no trial and no usage cap. Every feature on this page is available on the first visit.
Does File Size Checker upload your file to a server?
No. File Size Checker processes your file inside your browser, so it never reaches a DocTools server. That also means the tool keeps working if your connection drops mid-task.
Is there a file size limit?
The practical ceiling is your device's available memory rather than a server quota. Files up to roughly 100 MB work comfortably on a typical laptop in File Size Checker.
Do I need to install anything to use File Size Checker?
No installation is needed. File Size Checker runs in Chrome, Edge, Firefox and Safari, on desktop and on mobile, with no extension or plugin.
Can I use File Size Checker on a phone or tablet?
Yes. The File Size Checker interface adapts to small screens and supports touch input, though very large jobs are faster on a desktop browser.
What happens to your file when I close the tab?
It is discarded. File Size Checker keeps everything in temporary browser memory, so closing the tab removes every trace of the session.
Related tools
- Split by Size | Split PDF into parts with max file size
- Compress PDF | Reduce file size without losing quality
- PDF Page Size Changer | Change pages to A4, Letter and more, content scaled to fit
Last updated: 2026-09-07